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(ModeL) 2 Sheets-Sheet 1.

J. W. DEWEES. SEWING MACHINE.

No. 432,746. Patented July 22, 1890.

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No. 432,746, Patented July 22, 1890.

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SEWING-MACHINE.

SPECIFICATION forming part Of Letters Patent N0. 432,746, dated July 22, 1890.

Application filed August 2-2, 1889. Serial No. 321,573. (Model-l To all whom it may concern.-

Be it known that I, JOHN W. Dnwnns, a citizen of the United States, and a resident of the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings.

My invention has relation to high-speed sowing-machines of the class which operate to produce a double-chain or elastic stitch in the material to be sewed, and has particular relation to that portion of such machines which controls the movement of the looper for thelower thread, and has further relation to the take-up for said lower thread.

My invention has for its object to improve and simplify the construction and increase the efiiciency of the aforementioned looperoperating mechanism and take-up.

Heretofore the movement of the looper around the vertical axial line of the needle in machines of the above-mentioned character has been obtained in various ways-for instance, by the use of a rocking frame j ournaled at both ends and oscillated in a vertical plane by a cam on the main shaft, on which frame is journaled a crank to which is pivotally connected the needle-arm pitman and on which is supported the looper, the result obtained by this construction being the said movement of the looper around the neodle while rocking in response to the swing of the rocking frame.

My invention consists in the provision of a straight lever journaled on a vertical stud on the base-plate of the machine and having formed thereon at its center diametrical 0ppositely-extending arms for the reception of said stud, said lever being adapted to oscillate horizontally in'response to the motion of a ball or round-edged eccentric on the main shaft andaconnecting-rod therefor attached to the inner end of said lever by a ball-andsocket joint. The outer end of this lever is formed with avertical T-shaped head, having a socket therein for the reception of and in which is journaled a stud, in the upper end or head of which stud is secured the looper.

This stud has an outwardly-extending h0rizontal arm, passing through a slotin the wall of said socket, provided with a ball on its outer upturned end, which ball is secured and has its bearing in a socketin a shell or casing on the outerend of the needle-arm pitman, said pitman imparting the longitudinal reciprocating movement to the looper through the ball-arm and the stud in which said looper is secured, while the eccentric and rod are imparting the transverse movements to the looper, the result being a regular movement of the looper curvilinearly in a horizontal plane, describing an ellipse around the vertical axis of the needle.

My invention further consists in the provision of a novel form of take-up for the lower thread, consisting of a straight bar pivotally secured at one end to the needle-arm pitlnan with liberty of movement horizontally, and at its other end slides between a pair of upturn ed lugs on the end of a laterally-projecting arm on the central-bearing portion of the looper-operating lever, said lugs having each an opening therein for the passage of the thread, and said arm of course moves in response to or coincidently with the movement of said lever. Secured on the upper surface of the straight bar is a block or lug with an opening parallel with and for the same purpose as the openings in the two first-mentioned lugs on the arm, said block being so disposed relatively to said lugs as to bring their openings into alignment at one extreme of the movement of the needlearm pitman, and when said pitman is making the first part of its return movement the eccentric which actuates the looper-operatinglever will cause said lever to remain for an instant at rest along with the arm on which the take-up bar slides. Thus the surplus slack in the thread will be taken up before the said arm begins to move, which latter movement is not in any case more than very slight and not nearly so great as that of the block on the said bar.

All the details of my invention will be more specifically described in the specification hereinafter and will be clearly understood upon referencebein ghad to the accompanying drawings, wherein Figure 1 is a side elevation of a sewing-mathe wall of the socket 9 chine with my improvements applied thereto, and Fig. 2 is an end elevation of the same. Fig. is a plan view ofthat portion of the machine shown in Fig. 1 below liney y. Fig. 4 is a vertical transverse section on line 0a 00 of Fig. Fig. 5 is a vertical longitudinal section of a detail.

A represents the needle-arm, B the head, 0 the needle-bar, D the base-plate, c the needle, E the fly-wheel, and. F the connectingrod between the fly-wheel eccentric and the needle-arm, all of which are of usual construction and need not be particularly described.

G represents the looper-operating lever provided with the vertically-extending oppositely-disposed arms 9 g, which are castintegral therewith or may be secured thereto. Said arms have a longitudinal opening therein for the reception of the stud H, (shown in dotted lines,) secured vertically on the baseplate and affording the central bearing for the lever G, said lever being secured thereon by the screw H passing into said stud and having a bearing at its lower end on the base-plate D. Lever G is provided also, with two horizontally extending oppositelydisposed arms or extensions g g at right angles with and about midway of the ends of arms 9 g. The inner -arm g is formed into a ball-shaped or rounded bearing for one end 7) of the connecting-rod I, the other end e" of said rod being secured on the eccentric I 011 the main shaft K, while the outer arm 9 is formed with two vertically-extending oppositely-disposed arms g similar to arms g g at its end, said arms forming a T-shaped head for the lever G. The arm g ,'being the lower one, is of a length sufficient to allow of the oscillation of the lever without said arm contacting with the base-plate. In this T- shaped head or in the arms 9 g is formed a socket g for the reception and journaling therein of the stud L, with the enlargement or head Z formed thereon, said head having a socket Z for the securing therein of the looper L, which is of usual shape, and said stud having secured thereto or integral there with or in a socket Z therein alateral arm M, which passes through a transverse slot. g in The outer end of this arm is upturned, as at m, and has secured thereon or integral therewith the ball m, which is secured and has its hearings in the shell N on the outer end of the needle-arm pitman N by means of the screw or plug n, the upturned end m passing through a slot n in the under side of said shell, and said pitman is secured at its inner end to the needle-arm Ain the usual manner. Thus, it will be readily understood, movement of the eccentric I and rod I will cause the lever G to oscillate horizontally on its stud H in a horizontal plane, accomplishing the movement of mitting an oscillating movement to the stud L and the looper L, which movement causes the said looper to travel in its proper paths at the front and rear of said needle, and the movements of said pitman and eccentric-rod are so timed that the motions of the looper will be in a horizontal plane in a regular curvilinear path around the needle.

0 represents the take-up bar, extending nearly parallel with the needle-arm pitman and secured pivotally to a collar n on said pitman by means of the screw 0 near its inner end, and having on its upper surface near its outer end the upright block 0, provided with the tl'iread-opening 0 This bar, at its outerend beyond said block, is retained by and secured between the upwardlyex tending lugs or forks g on the outer end of the rigid arm G, said arm being cast integral and moving correspondingly with the central bearing of the lever G, and said forks having notches g therein for preventing the dislodgment of the bar 0. Said forks have also thread-openings similar to the opening 0 and parallel therewith, in order that when the block comes between the forks said open- I ings will be in exact alignment.

lower thread R, which consists of the horizontal double-tongued sprin g-arms p with the offset or ears p thereon, said stop being se-' cured to the standard Q on the base-plate D by the screw 19 said tongues being intermittently opened and closed at proper intervals by the eccentric K, which contacts with the lower one of tongues 19. WVhen the tension is on the thread R, the take-up bar 0, withits block 0, will recede, while the forked arm G remains temporarily stationary, and take up the slack in said thread between the takeup and the looper L, after which taking up the arm G follows the bar 0 until it reaches the extent of its movement in that direction, the result being a much quicker taking in of the slack in the thread with a less movement of the take-up, than heretofore.

S represents the eccentric-rod, which is connected by the screw 5 to the link T of the four-motioned feed mechanism and is actuated by the eccentric S on the main shaft, the operation of which and the construction of these being substantially as heretofore, and need not be further described.

I am aware that the idea of intermittently stopping and releasin the lower thread as an adjunct to the operation of the take-up is old, as is also the specific form of ,stop shown in the drawings of my invention. Therefore I do not wish to be understood as claiming the same.

What I claim as new, and desire to secure by Letters Patent, is

1. In a sewing-machine, the combination, with the needle and feed mechanism, of a pivoted lever actuated by an eccentric on the main shaft and having arms g 9 the socket g and the slot g in said arms, the stud L,

the looper L, the arm M, and a pitman connecting the latter and the needle'arm, substantially asshown and described.

2. In a sewing-machine, the combination, With the needle and the feed mechanism, of the lever G, the arms g 9 the stud H, the screw H, the eccentric I, the eccentric-rod I, the shaft K, the stud L, the arms g f, the socket g", the slot 9 the looper L, the arm M, the ball on, the shell N, the pitman N, and the needle-arm A, all combined for operation substantially as specified.

In a sewing-machine, the combination, with the stitch-forming and feed mechanism and a stop or tension for the lower thread, of the bar 0, pivoted at one end on the pitman N, the forks g the notches g, the block 0, the thread-openings in said forks, and the opening 0 all combined for operation substantially as described.

4. In a sewing-machine, the combination, With the needle and feed mechanism, of the lever G, the arms 9 the stud II, the screw H, the eccentric I, the rod I, the arms g 9 the socket g, the slot g the stud L, the loopcr L, the arm M, the ball m, the shell N, the pitman N, the needle-arm, a stop or tension for the lower thread, the bar 0, pivoted at one end on said pitman, the forks 9 the notches g, the block 0, the threadopenings in said forks, and the opening 0 all combined for operation substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 21st day of 35 August, A. D. 1889.

JOHN V. DEWEES. \Vitnesses:

HENRY M. BOYD, WM. CARL. 

